21042111052 has 6 divisors (see below), whose sum is σ = 36823694348. Its totient is φ = 10521055524.

The previous prime is 21042111037. The next prime is 21042111059. The reversal of 21042111052 is 25011124012.

It is not an unprimeable number, because it can be changed into a prime (21042111059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2630263878 + ... + 2630263885.

Almost surely, 2^21042111052 is an apocalyptic number.

It is an amenable number.

21042111052 is a deficient number, since it is larger than the sum of its proper divisors (15781583296).

21042111052 is a wasteful number, since it uses less digits than its factorization.

21042111052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5260527767 (or 5260527765 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 19.

Adding to 21042111052 its reverse (25011124012), we get a palindrome (46053235064).

The spelling of 21042111052 in words is "twenty-one billion, forty-two million, one hundred eleven thousand, fifty-two".